End-to-end encryption and privacy controls.
Message and call for free* around the world.
Group conversations made simple.
Say it with stickers, voice, GIFs and more.
Reach your customers from anywhere.
Facebook的App用戶已達4.7億,iOS和Android平分秋色! https://qooah.com/2013/01/08/470m-facebook-mobile-app-users/